i'm not sure if this is the right forum and i'm not not a new player i haven't played galaxy legion in a long time, how do i empty my cargo hold???

Click the scrap button on any artifacts you don't want. Type in the number of artifacts in the box to scrap lots of items. Sell all your minerals from the sell all button at the bottom of the minerals tab..

and if you do all that and its still full, you have uninstalled modules in ur cargo. you either need to install em or scrap em to get them out of there...

A bit more detailed:

Your cargo hold is full of Minerals, Artifacts, and Uninstalled Ship Modules.

Sell the minerals you do not need. Scrap the artifacts you do not need - ask if you don't know what might be ok to scrap - some artifacts may not be super useful now but you don't want to scrap the limited number you have (such as time manipulators...)

Find modules you have on your ship that are NOT INSTALLED. Those take up space. Sell them if they are not mission-earned modules. You can't get more of the mission earned modules, so as a rule, don't sell them.